Car-brake mechanism.



E. H. DEWSON.

CAR BRAKE MECHANISM.

APPHCATION FILED DUI v22; 1915.

Patented J 11110 11, 1918.

INVENTOR W/Mfiw WITN ESSES IINITED @TATEb PATENT @Fhlfili j,

EDWARD H. DEWSON, 0F NEWYORK, N. Y., ASSIGNOR TO THE WESTINGHOUSE AIR BRAKE COMPANY, OF SYLVANIA.

WILMERDING, PENNSYLVANIA, A CORPORATION OF PENN- CAR-IBRAKE MECHANISM.

Specification of Letters Patent. Patented June lljil, 1918.

Application filed October 22, 1915. Serial No. 57,249.

To all wh0m it may concern:

Be 1t known that I, EDWARD H, DEWSON, of the borough of Manhattan, in the city,

county, and State of New York, have in vented a certain new and useful Improvement in Car-Brake Mechanism, of which improvement the following is a specification.

This invention relates to brake mechanism for cars, and more particularly to that type in which the brake is automatically applied under the control of a spring or other means normally tending to actuate the mechanism to applythe brake, and a manually operated device for opposing the action of the spring and for regulating the application of the same to any desired degree. A familiar construction of this type is the so-called momentum brake, in which a friction clutch normally tending to be forced into engagement by the action of a spring, is employed for connecting a Winding drum to the car axle and operate the brake chain to apply brakes by the momentum of the, vehicle, the action of the spring on the clutch being opposed and governed by the motormans hand lever.

In this type of brake mechanism it may be desired to apply the brakes independently from a different point than that usually occupiedby the motorman, and by a different person, as for instance, the conductor or other employee, or a passenger, and the object of my present invention is to provide means for interrupting the control of the brakes by the motorman and allow the spring to actuate the mechanism to cause an application of the brake independently of the motorman. I

Another object is to provide improved means under the control of the conductor for effecting an application of the brakes independently of the motorman. These and other objects will now more fully appear from the following detailed description of a preferred form of construction, and the novel features will be set forth in the appended claims.

In the accompanying drawingz'Figure 1 is a diagrammatic plan of a brake mechanism embodying my improvement; and Fig. 2, a section taken transversely of the car and showing the brake connections in elevation.

My improvement is adapted to be applied in connection with various forms of brake appliances designed to be actuated by the momentum of the vehicle, and I have shown a common form ofthis typecomprising a winding drum, 3, loosely mounted on the car aXle and connected by chain, 1:, with the brake rigging in the usual manner. A friction clutch device, 5, having a spring actuated member, 6, slidably mounted on the axle but connected to turn therewith, is employed to operate the winding drum when the clutch' members, which may be of any suitable tvpe, are forced into engagement by the action of the spring, 7. For holding the spring compressed and the clutch released, a bell crank lever, 8, may be provided having one arm bifurcated to engage a loose ring mounted in a groove of the clutch member, 6, and the other arm connected by a rod, 9, with a manually -mans control of the brake mechanism at the time that the same is operated by the conductor; l

* Various forms of connecting mechanism may be employed for this purpose, but according to a preferred construction, such as indicated in the drawing, a shaft, 10, may be mounted at some intermediate or middle portion of the carbeneath the car floor,

and carry a wheel, 11, fixed on said shaft, two arms, 12 and 12 loosely pivoted thereon, and clutch members, 13 and 13. slidably mounted thereon but keyed to turn therewith. The arms, 12 and 12 are each provided with a clutch face having an offset adapted to engage a corresponding face on the respective clutch members, 13 and 13, and be locked therewith when the arm is turned in one direction, the springs, 14 and 14?, acting to normally holdsaid clutch faces in engagement.

The brake rods, 9. and 9 leading to opposite ends ofthe car may be attached by short flexibleconnections at opposite sides of the wheel, 11, while the outer ends of the arms, 12 and 1%, are connected by the respective rods, 15 and 15*, with the brake handles,

at the opposite ends of the car. The clutch members, 13 and 13, may "be thrown out of engagement with the respective arms 12 and 12, by any suitable connections, such as levers, 16 and 16, actuated by link, 17,

bellcrank, 18, rod, 19, bell crank, 21, rod,

friction clutch, 5,, released.

less distance to allow the .spring, 7, to; force the friction clutch into engagement to wind up the drum, 3, andapply the brakes to the Wheels. The force of the brake application dcpendsuponthe distance thebrake handleis moved to permit the spring to expand. The force of the spring acting through rod, 9, wheel, 11, shaft, 10,,and the clutch members, 13 and.13-, constantly tends to turn the arms, 12 and 1-2, by the engagement of the interlocking projections on the clutch faces, this force being resisted and controlled by the brake handle, 28, and rod,

15, from one end of the car,'orffro1n a similar brake handle, (not shown), androd, 15*,

when the brakes are being operated from the other end 'of the; car, the vbrake handle being provided With the usual stops in its different positions.

When :for any reason {it 1s deslred that the conductor should apply the brakes, the

handle, 20, is simply turned sufficiently to move the clutch member, 113, longitudinally of its shaft against thespring, 14,-,and out of engagement with its arm, 12, thereby releasing the arm and permitting the spring, 7 to :fully expand and apply the brake with full force. This construction operates to interrupt the connection between the arm, 12,

and the shaft, 10,.so.that the motorman is I powerless to interfere with, the application of the brakes when. the; conduchandle is shifted. The connections from the conductors handle .eperate to throw out both clutch devices, 13--and 13,

in order toreleasc both arms, .12 and 12, and cutout'the motorman s. connections to either end of "the car. 'l/Vhen the conductors handle is restored toits normal *position, the springs, 14: and 14 :willagain shift the clutch members,:13 and 13 ,1 intoengagement With-the arms, 12 and 12 and restore the connection wand control toi the; 1110- torman.

Having now described my invention, what ters Patent is:

1. The combination witha brake applying mechanism, and a spring device normally tending to cause the brakes to apply, of a manual element under the control of .tl evn' ntorn an for opposing said spring and regulating the action of the same, and an lndependcnt manually operated g neans for interrupting the motormans control and ing 1nechanis1n and a spring device normallytending to cause the brakes to apply, of a motormanls brake handle, a connection from said handle to the spring device and including a clutchelement and an in dependent ,manually operated means havinga connection for throwing said clutch element out of engagement.

4. The combination with a momentum operated brake applying means, and a spring device normally tending to force same into action, of a motormans brake handle, connections therefrom for controlling theaction of saidspring, and an independent manually operable means for interrnpting the connection between the motormansbrake handle and said spr ng. andfor releasing, said spring.

5. The combination with a brake apply- .ingn echanism and means normally tend- ;mg to cause the brakes to apply, of a manual element under the control of the motornan for regulating the action of said means, and an independent manually operatedde- ,vicefor interrupting the moto'rmans control and permitting the brakestoautomatrcally apply.

6. ,The combination with a brake applying mechanism and means normally tending to cause. thebrakes to apply, of a manual element under the control of the motormanyfor regulatingthenction of said means, and an independent manually, operated de vice connectedto. said means for -actuating thetsame independently of. the position of the, not or1nans.- element.

In testimonywhereof I have herennto set .my hand.

EDWARD H. ,fDEWsoN.

1 Copies at; thimpatent 5 mgyh kw obtained fer five-cents, each, by, addressing. the ffncm miaaiener ,9! retreats.

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